Lens edge grinding machine



LENS EDGE GRINDING MACHINE Filed Oqt. 17, 1941 '1 Sheets-Sheet 1 INVENTOR $276" llukrsen J. C. ANDERSEN LENS EDGE GRINDING MACHI'NE Feb. 13, 1945 Filed'Oct. 17, 1941 'rfsneetysneet a FIG 3 Feb. 13, 1945. .J c, ANDERsEN 2,369,114

LENS EDGE GRINDING MACHINE Filed Oct. 17, 1941 7 Sheets-Sheet 4 V OE INVENTOR Orjen C /4ndsrscn N fw A TTORNE Y Feb. 13, 1945. J. c. ANDERSEN LENS EDGE GRINDING MACHINE 7 Sheets-Sheet 5" Filed Oct. 17, 1941 l N VENTOR Jo ry C Ana/elven \[\\i\\ N -ITTORNEY (O Feb. 13, 1945. J. c. ANDERSEN LENS EDGE GRINDING MACHINE F iled Oct. 17, 1941 7 Sheets-Sheet e FIG FIG l2 FIG l3 e i H x N mdfi m H Feb. 13, 1945. c ANDERSEN 2,369,114

LENS EDGE GRINDING MACHINE Y Filed Oct. 17, 1941 '7 Sheets-Sheet 7 FIG l7 a A TTOR/VE Patented Feb. 13, 1945 UNITED STATES PATENT w OFFICE 2,369,114 LENs EDGE cnmnme MACHINE Jorgen 0. Andersen, Rochester, N. Y,

Application October 17, 1941, Serial No. 415,439

11 Claims.

This invention relates to lens edge grinding machines and more especially to machines for grinding the peripheral edge of large number of lenses to make them of uniform size and the principal object of this invention is 'to provide a novel machine in which one lens is eiilciently mounted and centered at one station while another lens is accurately ground .to size at another station in the cycle of operation of the machine.

A further object of this invention is to provide a lens edge grinding machine with a plurality of lens supporting spindles and cooperating driving means with which the lenses are rotated at a high speed for the lens centering operation and at a low speed for the edge grinding operation. g

A still further object of this invention is to 1 provide the machine with means for individually controlling the size of each lens relative to the center of the spindle on which it is supported.

Another object of this invention is to provide the machine with a novel indexing mechanism with which each of the plurality of lens supporting spindles is accurately located at the stato another while a mounting and centering operation or a grinding operation takes place on one of the lens supporting spindles.

Another object of this invention is to provide the machine with self centering spindles and spindle bearings.

Another object of this invention is to provide a spindle carrying turret with novel driving means which, in its operation, automatically advances the turret for movement of the spindles from one station to another and then automatically drives the spindles for'rotation of the lensw at a predetermined speed for cooperation withthe grinding wheel. a Another object of this invention is to provide the driving mechanism of the machine with means whereby one of the spindles may be rotated at an increased rate of speed at one of the stations while the other spindles rotate at a uni form grinding speed at the other stations.

Another object of this invention is to provide the lens edge grinding machine with anovel drive operated by asingle motor-to have the various mechanisms of the machine operate to eiiiciently perform their functions in cooperation I with each other.

These "and other objects secured by my present invention provide a lens edge grinding. ma-

the size of each lens is uniformly ground on all spindles of the turret, and in which the spindles are self adjusting and its bearing completely protected against intrusion of water, abrasives and dirt for substantially continuous operation controlled by an interlocking mechanism which makes it possible touse a practically inexperienced operator with but brief instructions for the operation of the machine.

The objects and attendant advantages of this invention will become more clearly apparent from the detailed description thereof which follows, reference being had to the accompanying drawings in which Figure 1 is an end elevation of the machine.

Figure 2 is a rear elevation of the machine.

Figure 3 is a vertical sectional view of the machine taken on the line 3-3 01' Figure 2.

Figure 4 is an enlarged front elevation of the upper portion of the machine.

Figure 5 is a horizontal sectional view of the machine taken substantially on the line 5, 5 in Figure .4.

Figure 6 is an enlarged sectional view of one of the clutches for the operation of a lens supporting spindle, the section being taken onthe line 6-5 in Figure 5.

Figure '7 is a detail sectional view of one end of the lens supporting spindles, the, section being takenon the line 1-1 i Figure 5.

Figure 8 is a vertical sectional view of the rear of the turret, the section being taken on the line 8-8 in Figurefi.

Figure 9 is a vertical sectional view of the index locking mechanism, the section being taken on the line 8-9 in Figure 5.

Figure 10 is a detail perspective view of the locking latch of the index locking mechanism. Figures .11 to 15 inclusive show progressive positions of the indexing plate and it's locking mechanism as it advances from the release of one of the locking pins to the locking position of the succeeding locking pin. I

Figure 16 is a longitudinal sectional view of the micrometer size control, the section being taken-0n the line "-48 in Figure 5.

I Figure 17 is a. top plan view of a modified form of the machine with a portion thereot. broke away and illustrated-in section. r.

plate It carried by the spider 9.

As illustrated in the figures of the drawings, the machine is mounted on a base I which car ries the bed- 2 for the support of the transmission housing 3 at one end and the index hous- .ing 4 at the other end.

The turret housing 5 is located adjacent the transmission housing and is closed at the outer end by the end plate 6 and at the inner. reduced end by the end plate 1. trically supports the hub 8 of the spider 9 in the reduced end ofthe turret housing. The end of the hub 8 in turn is revolvably supported by the antifriction bearing l located in the fixed center bracket ll of g the transmission housing. A drive shaft I2 is mounted to freely rotate in the fixed center bracket ii and'the hub 8, and is revolvably supported at one. end by the antifriction bearing l3 in the center bracket H and at the other end by the antifriction bearing II in the hub 8. I

The end plate 6 at the outer endof the turret is supported by the turret shaft i which extends centrally thru this end plate into the turret where it is fixedly mounted in the bearing The turret supporting shaft extends thru the The latter concenpitch is used for theattachment of one side of the lens to the end of the lens holders 2 la carried by the spindle. The pitch at first is pliable on the lens holder 2; so that the lens may be adjusted and centered. This is done by spinning the spindle and the lens at a high rate of speed while the centering tool supported on the centering table 28' is held thereagainst until the lens runs true with the spindle.

To provide for the rotation of each spindle at a high rate of speed a tooth clutch member 29 is provided on the outer end of the hub of the clutchmember 26. This tooth clutch member is adapted to cooperate with a'corresponding tooth clutch member 30 carried by the drive shaft 3|. The latter is movable endwise in the sleeve 32 which in turn is revolvably upported in the antifriction bearings 33, 33 in the transmission housing 3. The sleeve carries the pulley 34 for rotation thereof and the drive shaft which is splined thereto.

A swinging yoke 35, which engages the drive shaft, is adapted to move the clutch member 30 into and out of engagement with the clutch memindex housing to the rear thereof where its reduced end is revolvably supported by the antifriction bearing l'l. Clearance in the cap l8 of the index housin permits endwise movement of the reduced end of the turret shaft in the antifriction bearing and thus provides for expansion and contraction of the turret shaft at this end of the shaft without affecting its support of the turret and the driving mechanism associated therewith at the other end thereof.

Keyed to the turret shaft within the index housing I is the index plate iii-which carries four axially extending index pins 20, 2|] that are radially spaced on the index plate and concentricallyarranged thereon so as to be in axial alignment with the center of rotation of four lens supporting spindles 2|, .2! in the turret housing 5.

Each lens supporting spindle is mounted to rotate in a spindle housing 22 which in turn is journaled in the end plate 8 of the turret and the bearing plate 15 of the spider 9'within the turret. -Each of the spindle housings carries a sleeve gear 23 in mesh with the central drive gear 24 carried by the drive shaft l2. In this way rotation of the'drive shaft by the worm or spiral gear 25 provides rotation of all four spindle housings with the spindles 2| projecting therefrom when the turret as a whole is locked-against rotation. Transmission of the rotary movement of the sleeve gears to each of the spindle housings is thru 'a-rollef'clutch' made up oftheclutch member 26 and the rollers 21, 21. This clutch member and the rollers are so formed and arranged that rotation of the tated by the drive gear 24, causes the rollers 21 to be wedged between the wall of the sleeve gear and the clutch member as illustrated in Figure 6 and thus provides'a driving connection between the sleeve gear' and the clutch member and in turn the spindle'which is keyed to the clutch .member.

, Rotation of the spindle housings and their spindies in this'manner is at a predetermined low rate of speed which is most efficient for cooperation with the grinding wheel in grinding the edges 'of the lenses supported by thespindles as will hereinafter be described. However, before the be ground, they must be mounted and lenses can centered on the end of the spindles. Suitable sleeve gears, when ro-y her 29 for the rotation of each spindle whenbrought in alignment with the drive shaft 3| in the position in which the finished lens is taken off the spindle and a new one is attached and centered thereon.

The clutch connection provided between the clutch member 26 and its sleeve gear 23 permits the rotation of the, spindle within the spindle housing at ahigher rate of speed than the spindle housing because the higher rate of speed of the clutch member causes the clutch rollers 21 to release their wedging engagement with the sleeve gears and thus permit independentrotation at the higher speed'without affecting the operation of the sleeve gears by the central drive gear 24. v

As above pointed out, rotation of the spindle housings by means of the drive gear 24 and the sleeve gears 23, 23 takes place when the turret housing 5 is held locked against rotation. Inthis locked position one of the spindles islocated' and centered, another is ground and finished. As the turret has four spindles, one of the spindles is located intermediate the front and rear position at the top of the turret and carries an unfinished but centered lens ready for the grinding operation, while the other intermediately located spindle at the bottom of the turret carries a finished lens ready to be taken ofi therefrom.

The turret is held locked in each of its "four poitions by a latch mechanism provided in the index housing I. This latch mechanism cooperates with the index plate IS and the index pins 20, 2|! carried thereby. The index plate is keyed to the turret shaft for rotation therewith, and the turret and the index pins 20 are arranged on the index plate in axial alignment with the spindles H in the turret. For the latch mechanism the index pins are made to project from the rear of the index plate for engagement latch 36. As illustrated in Figures 9 to 15 inelusive, this locking latch is mounted in the bottom of the index housing'and is keyed to the rock shaft 3l'so as to swing between the index pin extensions and the turret shaft IS on the movement of this rock shaft. The face of the latch adwith the locking jacent to the index plate I8 is cut out to provide in the upper portion the stop and guide pad 38 leading to the anvil stop 38 and locking channel 48 and to provide in the lower portion of the late the gate 4|.

The locking position of the locking mechanism is illustrated in Figure 9 in which an index pin extension is located in the locking channel 40 and rests against the anvil stop 38. In this position all other index pin extensions are free from the locking" mechanism. However, when the locking latch is swung into the dotted line position illustrated in Figure 9, the index plate and with it the turret, is released so that rotation of the turret in the manner hereinafter described, causes the released index pin extension to move downward in front of the latch and thru the gate 4| behind the latch while the index pin extension at the top of the index plate moves in front of the top portion of the latch to limit return of the latch from its dotted line position by its engagement with the guide and stop pad 38 and have this index pin extension prevent full return of the locking latch until movement of the pin extension is arrested by the anvil stop 38. At this point the pin extension is free to enter the locking channel 46 into the locking position illustrated in Figure 9. For the purpose of releasing the index plate and the turret, the latch 36 is operated by the lever arm 42 keyed to the rock shaft 31 on the outside of the index housing at one end of the machine, and to return the latch into locking position this lever arm is provided with a counterweight 43 which operates to automatically swing the latch from its unlocked position back into locking position in the. manner above described on the release of the lever arm by the operator.

Rotation of the turret on the release thereof by the latch mechanism in order to move thespindles with their lenses from one station to another is provided by the central drive gear 24 and the sleeve gears 23 which mesh therewith. To make this possible the lens spindles 2| are provided with the tapered bearing shoulders 44 which are drawn against the tapered bearings which surround them by means of the spring 45. The latter surrounds the spindle end and is interposed between the cap screw 46 and the shou1- der 4! in the hub of the clutch member 26.

increased frictional contact provided in this manner between the spindle and its bearing causes a slight drag on the spindle which is overcome by the positive drive between the central drive gear and the sleeve gear as long ts the turret is held stationary. However when the turret is released the draw on all of the spindles is sufficient to hold the spindles and with it the sleeve gears stationary so that the central drive gear, instead ,of rotating the sleeve gears, moves bodily in a The drive gear 24. T stop operation of the turret. and its spindles, as above described, thehandle '59 is operated to move the cam plate 58 to raise the pulleys 56, thereby causing the belt 68 to disengage itself from driving engagement with its pulley 56. Transmission of power to the pulley 6| is thus interrupted to prevent further operation of the turret and its spindles thru the drive above described. I

Rotation of the lens spindles in mounting and centering the lenses, which, as above described, is done at a speed higher than that provided by the turret drive, is secured by a pair of cone pulleys 62 and 63. Cone pulley 62 is carried by the transmission shaft 5| and drives cone pulley 63 by means of the belt 64. ries cone pulley 63 has keyed thereto the pulley 65 and a belt 66 connects this pulley with the pulley 34 for rotation of the drive shaft 3| in the base 49. The driving pulley of this motor drives the pulley 58 on the transmission shaft 5| and a belt 54,-which passes over a pair of spring tensioned pulleys 53, drives one of a pair of pulleys 56 from the pulley 52 of the'transmission shaft operation of a spindle 2| thru the tooth clutch members 29 and 38.

Operation of the yoke 35 for engagement of the tooth clutch members 28 and 30 is'secured by the sliding rod 61 which is connected to the yoke 35' and is mounted to slide endwise in the bed of the machine with the free end of the rod projecting from the end of the machine. A bell crank 68 and link 69 connects the sliding rod with the treadle 10 so that depression of the treadle by the foot of the operator causes rotation of the spindle for centering purposes. Spring 1| returns the treadle into inoperative position and disconnects the tooth clutch members after the centering operation is completed.

In order to prevent release of the turret for movement of the spindles from one station to another while one of the spindles is rotated by the tooth clutch members, the sliding rod 61 carries on the outside of the bed of the machine an interlocking block 12. This block is set so that movement of the sliding rod by the treadle to cause engagement of the tooth clutch members brings the interlocking .block below the interlocking arm. 13 which is attached to the rock shaft 31 and its lever arm 42. Release of the locking mechanism for rotation of the tur- .ret to advance the lens spindles canftherefore,

not be effecte until the centering operation of the lens is lompleted and the tooth clutch members are separated. y

The grinding operation is performed by the grinding wheel 15 which is carried by the carriage l6. ported by the reciprocating and oscillating shaft 11 which is mounted in suitable bearings suspended from the bed of the machine at the rear so as to permit a swinging and endwise movement relative thereto. supported. the'spindle housing I8 which is provided at one end with the combined journal and taper thrust bearing I8 and atthe other end with a pair of antlfriction bearings 86, 88. The spindle 8| which is revolve 1y supported in these bearings is free to slide endwise in the antifriction bearings and the spring 82 which surrounds the spindle at.0ne end of the housing draws the tapered shoulder 83 of the spindle 8| intothe The shaft which car The carriage is clamped to and sup-' On the carriage 16 is taper thrust bearing at the other end of the housing. The tapered shoulder of the spindle in engagement with the tapered thrust bearing steadies the spindle in its rotation in the spindle housing and causes the spindle to automatically keep itself centered in its bearing by the action of the spring 82 on the spindle. The antifriction bearing facing the inside of the spindle housing is a radial bearing, while the other antifriction bearing is a combined radial and thrust bearing to properly support the driving end of the spindle in the spindle housing. The spindle has the pulley 84 keyed thereto for the rotation thereof.

-The grinding wheel in its attachment to the spindle is forced against the collar 85 which serves as a bearing guard that prevents intrusion of. dirt, water and abrasives. In the end of the spindle housing and on the opposing face of the collar 85 are provided concentric ridges 86 and 81 respectively which are spaced by concentric grooves arranged in such a manner that the ridges of the collar engage into grooves in the end of the spindle housing and vice versa and thus provide a protective labyrinth between .them that makes it difiicult for foreign matter to pass therethru and enter the spindle bearing. The collar 85 is beveled on the side facing the grinding wheel and thus provides a circular defleeting channel between it and the wheel which causes water running off the wheel when at a standstill to be deflected from the end of the spindle housing.

The grinding wheel I is driven by the motor 48 thru the transmission shaft 5I and the pulley 98 carried thereby. A belt 89 drives a pair of pulleys 90 which are mounted to freely rotate and move endwise on the shaft 11. From these pulleys a belt 9| drives the pulley 84 and with it the spindle 8i and the grinding wheel I5 carried thereby.

As above pointed out, shaft 11 is also mount- -ed to oscillate in its bearings and thus pivotally supports the carriage I6 to provide for the movement of the grinding wheel into and out of grinding contact with the lenses supported on the spindles of the turret.

The grinding wheel is manually brought into grinding contact withv each lens and after'the which moves in place under the interlocking pin 95 carried by the interlocking arm 13 of the lock- I while the grinding wheel is moved to and from its grinding position as well as during its grinding operation. When the locking mechanism is released with the grinding wheel in its inoperative position, the interlocking pin 95 is moved speed reduction mechanism 96 i driven from the grinding operation is completed is again manually withdrawn from the lens to permit movement of the finished -lens away from the grinding station and movement of an unfinished lens in its place. For this purpose the shaft 11 has keyed to the end thereof the handle 92 with which the shaft may be rocked to move the grinding wheel into and out of grinding contact with the lenses.

During the grinding operation it is of course necessary that the spindle, carrying the lens which is to be ground or is in process of being ground, rotate in an absolutely fixed position in 'order to have the grinding wheel perform its grinding operation accurately and uniformly on thelens supported thereon. For this purpose the turret is positively locked in each of its positions and to prevent the release of the locking mechanism while the grinding operation takes place, or prevent the movement of the grinding wheel toward the lens supporting spindles while the turretis released and moves its spindles'lfrom one station to another, an interlocking arm 93 moves with the handle 92 in its operation of the grinding wheel toward or away from a lens. This interlocking lever has a concentric locking edge 94 the bed 2 of transmission shaft 5| by the pulley 91 and the belt 90. This speed reducing mechanism operates a crank arm 99 and reciprocates the connecting arm I00. A lever link IN is adjustably connected to the connecting arm and is fulcrumed on the swinging link I02. The upper end of the lever link carries a ball member which engages the ball socket I03 carried by the shaft I1.

Oscillating movement of the lever link by means of the crank of the speed reducing mechanism thus causes the shaft to reciprocate in its bearings and move the grinding wheel back and forth during its grinding operation. The connection between the connecting arm I00 and the leverconnection betweenthe crank arm 99 and the connecting arm I00. a

The pressure of the grinding wheel on the lens during the grinding operation is determined by the counterweight I04 which is adjustably mounted on the arm I05. The latter projects from the bottom of the grinding wheel carriage 16 under the machine as illustrated i Fi 3 and carries an upright I06 with an antifriction roller I0'I projecting from the end thereof. With the grinding wheel in its inoperative position, the roller I01 engages the under side of the bottom of the bed 2 of the machine and moves back and forth thereon to hold the grinding wheel carriage in the inoperative position while it is being reciprocated in the manner above described.

When th grinding wheel is moved into grinding contact with a lens, the arm I05 swings with it and ove rbalances the weight of the grinding wheel carriage and its grinding wheel in order to hold the grinding wheel against the lens edge at, a predetermined pressure. This pressure may be increased or decreased by shifting the weight I04 either out or in on the arm I05. As the grinding wheel is moved into grinding contact the roller I01 is moved out of contact with the bed of the machine. I

For the accurate size control of the lenses the index pins 20, 20 carried by the index plate I9 are provided with fiat sides 20a, 20a which are ground thereon relative to the center and axis of their corresponding lens spindles 2| in the turret 5. These flat sunfaces are radially arranged on the index plate for cooperation with shoe m or the micrometer size control. This shoe is provided with the micrometer thread I09 which is threaded in the sleeve H but is held against rotation by the key member Ill. The latter is mounted on the stationary supporting bracket H2 which forms part of the grinding wheel carriag and is located to one side of the grinding wheel. Ad- .lustably clamped to the sleeve H0 by means of the adjusting nut H3 is the hand wheel I M which is provided on its face with the dial H5.

Rotation of the hand wheel thus causes the sleeve H0 to move the shoe in and out of the sleeve to provide a stop for the movement of the grinding wheel into grinding contact with the edge of the lens andpermit gradual grinding of the lens edge on further adjustment of the shoe to the desired diameter as finally indicated by the pointer IIB on the dial H5. The dial H5 is held locked against the hand wheel for rotation therewith but may be released for adjustment relative to the pointer IIB for its starting position.

In this way the operation of the-shoe by the handwheel accurately feeds the grinding wheel against the lens edge while the sliding contact of the shoe with the flat edge of the index pins 3. In a lens edge grinding machine the combination of a turret, a turret shaft for supporting one end of said turret, a spider supporting the other end of said turret, a plurality of spindle housings supported in said turret, a spindle revolvably mounted in each of said spindle housings, a'gear carried by each of said spindle housings, a driving gear centrally of said spider for joint rotation of said gears, clutoh'means connecting said gears with said spindles for rotation thereof with the turret held stationary, and frictional contact between said spindles and said spindle housings to provide for planetary movement of said gears with said spindles and said turret by said driving gear.

4. In a lens edge grinding machine, the combination of an axially moving grinding wheel,

' a rotatable turret, a plurality of lens supportaccurately guides the grinding wheel back and forth over the lens edge.

In Figure 17 I have illustrated a modified form of tha size control. In this modification the index pins carried by the index plate are replaced by flat bar members II! which ar mounted directly to the outside of the turret 5 and are circuinferentially spaced and arranged axially parallel relative to the spindles. .The outer surface of these bars is ground relative to the center and axis of their corresponding lens spindles in the turret for cooperation with the shoe I08 of the .size control which in this case is mounted on the spindle housing of the grinding wheel carriage. This arrangement of the size control is desirable for heavier grinding on larger lenses.

For the purpose of balancing the grinding wheel on its spindle a compensating disc I I8 is clamped to the outer face of the wheel. This disc is elongated and'is provided with a slot H9 which permits it to be shifted transversely of the spin- 1 dle as well as rotated thereon to provide for the necessary correction in balancing'the grindin wheel on the end of the spindle. I

I claim:

1. In a lens edge grinding machine having a plurality of rotating lens'supporting spindles, the combination of guide means arranged parallel to and movable with each of said lens supporting; spindles, size control means cooperating with each of said guide means and a grinding wheel guided for lateral and endwise movement relative to each of said spindles by said size guide means.

2. In a lens edge grinding machine the combination of a turret, a plurality of spindles rotatably mounted in said turret, a turret indexing plate axially spaced from said turret, a ro tatinggrinding wheel, means for moving said rinding wheel axially parallel to and transverse- I ly toward and awayfrom saidspindles inter"- mediate said turret and said. indexing plate, a size control member arranged axially parallel to each of said spindles and movable therewith, and size control means movable with said grinding wheel and cooperating with each of said size con trol members for limiting the movement of said grinding wheel toward and away from the spindles and guiding the endwise movement of said grinding wheel relative to said spindles.

ing spindles mounted in said turret, a guidin and indexing member arranged parallel to and cooperating with each of said spindles, indexing means cooperating with said indexing members for locating said turret in a plurality of stations adapted to have the lens supported by the spindles centered thereon at one of the stations and the lens edge ground to size at another station and cause said indexing members to guide said grinding wheel in its axial movement at the latter station.

5. In a lens edge grinding machine, the combination as set forth in claim 4 including means for rotating the spindles at a high grinding speed at the grinding station and common driving means for moving the turret from station to station and for rotating said spindles at a low centering speed at the centering station.

6. In a lens edge grinding machine the combination as set forth in claim 4 including a grinding wheel movable toward and away from and axially parallel to said lens supporting spindles and an adjustable sizing control member movable with said grinding wheel for movement into contact with and movement on said combinedguiding and indexing members.

7. In a lens edge grinding machine, the combination of a rotatable turret, locking means for locking said turret into avplurality of predetermined positions, means for operating said locking means, a spindle mounted to rotate in said turret, spindle driving means, means for connecting said driving means with said spindle, and interlocking means operated by said connecting means for locking said operating means and pre-.

vent release of said locking means during rotation of said spindle.

8. In a lens edge grinding machine the combination of a turret carrying a plurality of spindles, means for releasing and locking said turret to cause rotation thereof to consecutively ad- Vance said spindles to predetermined stations, a grinding wheel, means for swinging said grinding wheel toward and away from one of said stations; an interlockin member carried by said locking and releasing means, and means cooperating with said grinding wheel for engagement of said interlocking member to prevent swinging of a grinding wheel mounted to rotate 0n said carindex housing at the other end of said bed, a

turret housing rotatably supported between said transmission and .said'indexing housing, a plurality of spindles'mounted to rotate in said turret, a driving shaft for rotating said housing jointly with said spindles, a second driving shaft for individually rotating each of said spindles. a'

driving motor for the operation of both of said driving shafts, and means for transmittingmovement from said motor at a high rate of speed to one of said driving shafts and at a low rate of speed to the other of said driving shafts.

11. In a lens edge grinding machine the combination as set forth in claim 10 including a grinding wheel carriage movable endwise and mounted to rock toward and away from said turret, a grinding wheel mounted to rotate on said carriage, means for transmitting movement from said motor to said grinding wheel, and means for translating movement from said motor into an -15 oscillating motion for reciprocating said carriage.

JORGEN C. ANDERSEN. 

